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CRAIG MOORE

MEMBER
1990 CHEVROLET TRUCK

5.7 liter truck stalls when cold. Continues to stall and lack power until warmed up. Then it runs fine after it's warmed up. Any help would be appreciated.

Friday, November 16th, 2012 AT 5:53 AM

5 Replies

PAPAJOHNSLICE

MEMBER
108 POSTS

Check to see if you are getting the proper spark, take a spark plug out, attach the spark plug wire, and hold the threads of the spark plug against the engine block and have somebody turn it over a few revolutions, looks for bright blue or white colored spark, do this with all of them and report back with the results

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Friday, November 16th, 2012 AT 5:56 AM

PAPAJOHNSLICE

MEMBER
108 POSTS

Is it carb or fuel injected? Because there is a possibility that it's not getting enough air until the air intake is opened up

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Friday, November 16th, 2012 AT 5:59 AM

CRAIG MOORE

MEMBER
4 POSTS

Fuel injected

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Friday, November 16th, 2012 AT 6:02 AM

CRAIG MOORE

MEMBER
4 POSTS

I'm thinking iac valve

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Friday, November 16th, 2012 AT 6:03 AM

HMAC300

MECHANIC
48,601 POSTS

On tbi units they had aproblem of blowing the gasket under them, check for that as well as soft hoses goign to pcv and map sensor on firewall. If those are soft replace them spray chooke cleaner under the tbi to check for leak if rpm change then you've found the leak. If it continues to do that after these fixes, then check fuel pressure which shold be 9-11psi. Also if the question is not answered by an expert they could lead you ln the wrong direction. You can also clean iac with choke cleaner but do not remove it.